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What is AU?

Sun AU is the native audio format for Sun Microsystems workstations, using simple mu-law encoding or uncompressed PCM.

What is VOX?

Dialogic VOX is a compressed speech audio format optimized for telephony systems, voice mail, and interactive voice response.

When Should You Use AU vs VOX?

Use AU When...

AU is built for legacy unix audio, sun workstation sound. Think of it as the perfectionist — every pixel, every sample, preserved exactly as intended.

Use VOX When...

For telephone systems, voice mail, ivr systems, nothing beats VOX. It hits the sweet spot between visual quality and file size, making it the default choice for millions.

AU vs VOX: Key Differences

  • •The core technical difference: AU relies on lossless compression whereas VOX uses lossy compression.
  • •The switch from lossless compression to lossy compression means you gain significant space savings while accepting minor quality trade-offs.
  • •Transparency: N/A — converting from AU will merge transparency into a solid background
  • •Storage footprint: Small to medium, similar to WAV for AU vs Very small, ideal for voice storage for VOX.
  • •Primary audience: AU is built for legacy unix audio, sun workstation sound scenarios, while VOX focuses on telephone systems, voice mail, ivr systems — pick the format that matches your output requirement.

Advantages of AU

  • ✓The lossless nature of AU means file sizes stay reasonable while handling Legacy Unix audio, Sun workstation sound efficiently.
  • ✓From mobile devices to enterprise servers, AU is recognized and supported everywhere.
  • ✓The trade-off for AU's perfection is larger files — but for archival work, it is worth every megabyte.
  • ✓AU is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Advantages of VOX

  • ✓The lossy nature of VOX means file sizes stay reasonable while handling Telephone systems, voice mail, IVR systems efficiently.
  • ✓From mobile devices to enterprise servers, VOX is recognized and supported everywhere.
  • ✓Storage and bandwidth costs drop significantly when using VOX thanks to its efficient compression.
  • ✓VOX is a first-class citizen in all major software ecosystems, from creative suites to development environments.

Common Use Cases for AU to VOX Conversion

  • Radio commercials
  • Guided meditation recordings
  • Audiovisual installation
  • Music education
  • Conference call recordings
  • Field recording preservation

Industry Applications

Audiobook PublishingMusic StreamingLive SoundForensic AudioMedical TranscriptionRadio Broadcasting

Best Practices for AU to VOX Conversion

  • →For AU to VOX: match the sample rate and bit depth to your delivery platform — 44.1 kHz / 16-bit is the standard for music
  • →Apply loudness normalization (LUFS) before conversion to ensure consistent volume across your audio library
  • →VOX prioritizes quality — ensure your storage can accommodate the resulting file sizes
  • →Check that metadata tags (artist, album, track number) survive the conversion
  • →Convert a short segment first to verify quality at your chosen bitrate
  • →Keep a lossless master copy in case you need to re-encode for a different platform

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about AU and VOX formats in our detailed guide.

Troubleshooting AU to VOX Conversion

  • !VOX audio quality degraded vs AU → use a higher bitrate (at least 256 kbps for music)
  • !VOX file won't play on your device → check format compatibility with your player or platform
  • !Metadata (artist, album, title) lost after AU to VOX conversion → some formats like VOX may not support ID3 tags
  • !Volume changed after converting AU to VOX → normalize audio levels before conversion for consistent playback

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About AU and VOX

AU

AU (AU audio) - Sun AU, legacy Unix audio format for Sun workstations. Best for legacy unix audio, sun workstation sound.

VOX

VOX (VOX audio) - Dialogic VOX, compressed speech audio for telephony. Ideal for telephone systems, voice mail, ivr systems.

Format Comparison

CompressionLossless → Lossy
TransparencyN/A
Use CaseConvert from legacy unix audio, sun workstation sound to telephone systems, voice mail, ivr systems
File Size~Very small, ideal for voice storage after conversion

FAQs

Is converting AU to VOX free?

Yes, GoConvertFile offers free conversion of AU to VOX for files up to 100MB. No registration required.

How long does it take to convert AU to VOX?

Most AU to VOX conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is VOX best used for?

VOX is ideal for telephone systems, voice mail, ivr systems. Dialogic VOX, compressed speech audio for telephony

Does converting AU to VOX lose quality?

Yes, converting AU to VOX uses lossy compression, which reduces file size by discarding some visual data. Set quality to 85-95% for a good balance of quality and file size.

What file size should I expect after converting AU to VOX?

VOX files are typically 50-80% smaller than AU files because VOX uses efficient lossy compression. The exact reduction depends on quality settings.

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